1. Division of Cardiovascular Medicine, University of Florida College of Medicine, Gainesville, Florida.
2. Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania.
3. Cardiovascular Institute, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania.
4. Division of Cardiovascular Medicine, University of Southern California, Los Angeles, California.
5. Division of Cardiovascular Disease, University of Alabama at Birmingham, Birmingham, Alabama.
6. Division of Heart and Vascular Diseases, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland.
7. Division of Cardiology, Department of Medicine, Cedars-Sinai Research Institute, Cedars-Sinai Medical Center, Los Angeles, California.